Flight profile · United Airlines
UA1323
Washington (IAD) to Las Vegas (LAS) · scheduled 9:00 AM – 11:04 AM
How UA1323 performs
725 operations, March 2024 – August 2026.
Between its first and last recorded date on IAD → LAS, UA1323 averaged about 6 operations a week (725 in 908 days, cancelled ones included).
UA1323 arrived on time 92.4% of the time, against 82.7% for all IAD → LAS flights, so this departure is 9.7 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 8.7 points better.
Source: US DOT Bureau of Transportation Statistics · 725 operations, March 2024 – August 2026 · If UA1323 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How UA1323 compares to other flight numbers, not just to itself.
This flight stays close to typical even on its worst days, a smaller gap than 91% of 12,358 comparable flight numbers.
A typical arrival is 12 min early, and the worst tenth are only 22 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – August 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where UA1323 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA1323 | 92.4% | 0.83% | -12 min | 2.4% | 725 |
| United Airlines on IAD → LAS | 83.7% | 0.59% | -11 min | 6.6% | 3,075 |
| All IAD → LAS flights | 82.7% | 0.58% | -11 min | 6.9% | 3,291 |
UA1323 cancelled 6 of 725 operations (0.83%), close to the 0.58% for IAD → LAS.
2.4% of UA1323’s arrivals were an hour or more late, against 6.9% across IAD → LAS, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – August 2026
Why UA1323 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA1323 on IAD → LAS. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies UA1323 comes in late, and what that does to the departure.
The aircraft flying UA1323 came in 15 or more minutes late on 14% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into IAD: 507 of 719 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| UA1323 | 14% |
| Network, same turn | 23% |
A long gap on the ground gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often UA1323’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – August 2026
From pushback to gate
When it leaves IAD late, does that still matter by the time it reaches LAS?
UA1323 pushes back an average of 1.2 minutes late and reaches the gate at LAS an average of 8.1 minutes early. The 9.4 minutes between those two figures are slack the published schedule already carries, so on average a late pushback on this flight is made up before the gate. It spends 20.9 minutes on the taxiways at IAD, 1.2 minutes longer than a typical IAD departure in the same hour.
On arrival at LAS, UA1323 spends 8.6 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at LAS spends on the ground before reaching the gate.
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 7,918 IAD departures. Taxi-in is landing to gate, set against 583,484 arrivals at LAS. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – August 2026
The hour it leaves IAD
UA1323 has one departure time, 9:00 AM, so this is what that hour at IAD is worth.
On-time arrival rate. 7,918 departures from IAD are scheduled in the 9 AM–10 AM hour over the period, against 175,140 across the whole day.
UA1323 is scheduled out of IAD at 9:00 AM, in the 9 AM–10 AM bank. Departures from IAD in that hour arrive on time 87.6% of the time against 80.8% across the airport’s whole day — the slot alone is worth 6.7 points better before anything about this particular flight is considered.
Both airport figures cover every destination from IAD, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes UA1323 has flown
Carriers reassign flight numbers. UA1323 also served these 7 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| LAS→DEN Las Vegas to Denver | March 30, 2025 – August 31, 2026 | 233 | 75.1% |
| DEN→GTF Denver to Great Falls | March 5–28, 2026 | 24 | — |
| EWR→DEN Newark to Denver | August 19, 2024 – September 25, 2024 | 38 | — |
| IAD→MCO Washington to Orlando | February 15, 2024 – March 6, 2024 | 21 | — |
| SNA→ORD Santa Ana to Chicago | September 29, 2023 – February 14, 2024 | 138 | 86.0% |
| ORD→IND Chicago to Indianapolis | September 29–30, 2023 | 2 | — |
| STL→DEN St. Louis to Denver | July 5, 2023 – September 28, 2023 | 71 | — |
The figures above describe only IAD → LAS, the route UA1323 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
10 min late
against a median of 12 min early
Percentiles over 725 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1323 this flight | United Airlines | 92.4% | 12 min early | 725 |
| UA780 | United Airlines | 73.7% | 7 min early | 678 |
Among all 2 departures on this route with at least 600 operations, UA1323 has the highest on-time rate. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 725 records of UA1323 operating IAD → LAS, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed